期刊
SCRIPTA MATERIALIA
卷 191, 期 -, 页码 131-136出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2020.09.027
关键词
Refractory high-entropy alloys; Grain Refinement; Phase stability; Mechanical properties
类别
资金
- National Natural Science Foundation of China (NSFC) [51804032]
- China Postdoctoral Science Foundation [2018M640076]
The novel VxNbMoTa high-entropy alloys with vanadium concentrations of 0-25 at.% exhibit exceptional phase stability and high temperature strength, as well as excellent room-temperature ductility and resistance to high temperature deformation.
Poor high/medium-temperature phase stability and/or low room-temperature ductility are currently bottlenecks of refractory high-entropy alloys (RHEAs) that restrict their high-temperature applications. Here, we explored novel VxNbMoTa RHEAs with vanadium concentrations of 0-25 at.%. VxNbMoTa RHEAs exhibit a single body-centered cubic (BCC) structure with unprecedented phase stability at a wide temperature range from solidus down to 350 degrees C. The grain structure of VxNbMoTa can be substantially refined when increasing the V concentration since higher V contents induce stronger solutal effects which contribute to higher growth restriction factors. Equimolar VNbMoTa exhibits the yield strength of 811 MPa at 1000 degrees C that is superior to most RHEAs reported by far, and this alloy also shows excellent roomtemperature ductility with the fracture strain > 25% and no strain-softening at high temperature, which is rarely seen in many popular RHEAs. These exceptional performances of VNbMoTa enable it to be a very promising material for high-temperature applications. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据